some updates ...
I'm on the manufacturing of two muffler for the 456 of my friend, next saturday i will complete.
About bypass control, after speaking with him about his needs ..I thought to do the follow configuration:
- bypass normally opened
- rubber pipe between air intake
manifold and th evaccuum actuator
- nothing switch
In this way the expected function is following:
- at start bypass are opnen and will be closed after approx half second
- during driving with less percentual of gas (30/40% to be verify) bypasses are closed due to the intake manifold vacuum.
- when gas pedal id pushed over 30/40% , the intake manifold vacuum go down and bypass will open ...
This at least in theory ....
My friend two weeks ago did a test, and result is was positive!
The pedal position that open the bypasses can be adjusted, by means of modification of the vacuum actuator spring preload, however my friend id happy, at least for his taste.
Him asked me also to indicate my "logo" on the tails... i'm contrary but he wanted ....
Following some pictures of the tails and of the muffler on the welding jig.